Vibratory devices



July 31, 1956 H. c. NlGL 2,756,601

VIBRATORY DEVICES Filed March 18, 1955 2 Sheets-Sheet l y Z X n SHOCKABSORBER SHOCK ABSORBER 24 HANS C. NIGL man- W ATTORNEYS 1, 1956 H. c.NIGL ,15

VIBRATORY DEVICES Filed March 18, 1955 2 Sheets-Sheet 2 SHOCK ABSORBERSHOCK ABSORBER -H' INVENTOR HANS C. N I GL BY WW ATTORNEYS United StatesPatent VIBRATORY DEVICES Hans Carl Nigl, Fontainebleau, France, assignorto Societe Preparation Industrielle des Combustibles, Fontainebleau,France, a French company Application March 18, 1955, Serial No. 495,290

Claims priority, application France March 19, 1954 '10 Claims. (Cl.74--26) This invention relates to vibratory units and has moreparticular relation to vibratory units of the type in which thevibrating body of the unit is vibrated by an excenterweight mechanism.

One object of the present invention is to provide a novel and improvedvibrating unit comprising a displaceably resiliently supported bodyvibrated by an excenter-weight mechanism in which the centrifugal forceproduced by the excenter-weight mechanism is divided into twoperpendicular periodical forces, one of which produces a rectilinearvibration of the excenter-weight mechanism in relation to the body, andthe other a rectilinear vibration of the whole device.

Another object of the present invention is to provide an improvedvibrating unit, as characterized above, wherein the excenter-weightmechanism is mounted on the body of the unit so that its axis ofrotation is substantially parallel to the vertical planes outlined bythe trajectories of each point of the body of the unit.

Another object of the present invention is to provide an improvedvibrating unit, as characterized above, wherein said excenter-weightmechanism is mounted on said body by means of flexible blades soconstructed and positioned as to permit a free vibration of theexcenterweight mechanism in a direction extending transversely of theunit but assuring a rigid coupling with the unit in the directionparallel to the vertical planes outlined by the trajectories of eachpoint of the body of the unit.

Another object of the invention is to provide an improved vibratoryunit, as. characterized above, including shock absorbing meanspositioned to reduce the excessive amplitudes of the vibrations of theexcenter-weight mechanism in the direction transverse of the unit,during the passage of the critical speed when starting up or stoppingthe device.

A further object of the present invention is to provide a novel andimproved vibrating unit which is simple and sturdy in construction,inexpensive in manufacture, and eflicient in operation.

Other objects and advantages of the invention will appear in thefollowing specification when considered with the accompanying drawings,wherein:

Fig. 1 is a diagrammatic view, in side elevation, of one embodiment of avibrating unit constructed in accordance with the present invention;

Fig. 2 is an end elevation of the apparatus shown in Fig. 1;

Fig. 3 is a diagrammatic view, in side elevation, of a modified form ofthe apparatus shown in Fig. 1; and

Fig. 4 is an end elevation of the apparatus shown in Fig. 3.

The present invention provides a novel and improved vibrating unit and,in general, comprises a displaceably, resiliently supported bodyvibrated by an excenter-weight mechanism in which the centrifugal forceproduced by the excenter-weigh-t mechanism is divided into twoperpendicular periodical forces, one of which produces a 2,756,601Patented July 31, 1956 rectilinear vibration of the excenter-weightmechanism in relation to the body and the other a rectilinear vibrationof the whole device. The invention contemplates the use ofexcenter-weight mechanism comprising a transom positioned above andextending transversely of the body of the unit and carrying a shaft onwhich is mounted one or more excenter-weight pulleys with the pulleysconnected in any suitable usual manner to a drive mechanism such as apulley driven by a motor. The shaft may be a fixed shaft on which theexcenter-Weight pulley or pulleys are rotatably mounted, or they may bekeyed on a shaft rotatable between bearings carried by the transom. Theonly requirement being that the axis of rotation of the excenter-weightmechanism be substantially parallel to the vertical planes outlined bythe trajectories of each point of the body of the unit. The transom issupported on the body of the unit by blades flexible in a direcionextending transversely of the body and rigid in a direction parallel tothe vertical planes outlined by the trajectories of each point of thebody of the unit.

Referring now to the drawings, there is diagrammatically illustrated inFigs. 1 and 2, one embodiment of apparatus constructed in accordancewith the present invention. As there shown, the apparatus includes avibratory body 10 mounted upon a frame or base 11 as by means of aplurality of flexible blades 12. The means for vibrating the bodyincludes an excenter-weight pulley 13 rotatably mounted on a fixed shaft14 carried by a transom, indicated generally at 15, positioned above andextending transversely of the body 10. The transom is formed of parallelbeam members 15' connected at their ends, and is supported as by meansof flexible blades 16 having their upper and lower ends fixedlyconnected to the ends of the transom and the body 10, respectively' Theexcenter-weight pulley may be rotated in any suitable usual manner, asby means of a belt starting from a pulley 17 driven by a motor M. Ahelical spring 18 mounted on the frame 11 supports the body 10 so as tocancel out the component of the perpendicular weight in the direction ofthe blades 12.

Through the rotation of the excenter-weight pulley, the transom 15receives an elliptical or circular vibrating motion, this motion istransmitted to the body 10 in the direction xx due to the rigidity ofthe flexible blades 16, while the transverse vibration along the line yyis absorbed by the flexibility of the blades 16 in a direction extendingtransversely of the body and is not transmitted to the body, resultingin a rectilinear vibration of the body following the direction xx.

To reduce the excessive amplitudes of the transverse vibrations duringthe passage of the critical speed when starting up or stopping thedevice, the body 10 is fitted with shock absorbing means such ashydraulic devices 19 positioned to engage stop members 20 carried by thetransom 15 and slow down the thrusts of the transom.

In Figs. 3 and 4 there is illustrated a modified form of vibratory unit.In this particular modification, the body 10 the flexible blades 16, thetransom members 15" carrying shaft 14 and excenter-Weight pulley l3, andthe driving means including pulley 17 and motor M are identical to thecorresponding members as shown in Fig. 1. However, in this modification,the body 10' is supported by being suspended from a support frame,indicated at 21, as by means of four cables 22, each having its upperend portion supported as by helical springs 23 mounted on the frame 21.

In this particular modification, the shock absorbing means for reducingthe excessive amplitudes of the transom vibrations in a directionextending transversely of the body 10', are shown as comprisinghydraulic devices 3 19" mounted on frame members 24 suspended from thesupporting frame 21.

In this modification, as in the modification shown in Figs. 1 and 2, theexcenter-weight mechanism has its free vibration in a generallyhorizontal direction perpendicular to the vertical plane of vibration ofthe body of the unit, as the flexible blades coupling theexcenter-weight mechanism to the body of the unit are rigid in thedirection parallel to the vertical vibrating plane of the body of theunit and flexible in the direction perpendicular to that direction.

From the foregoing, it readily will be apparent that there has beenprovided a novel and improved vibratory unit in which the body of theunit is vibrated by means of an excenter-weight mechanism mounted on thebody so that its axis of rotation is substantially parallel to thevertical planes outlined by the trajectory of each point of the body,said excenter-weight mechanism being connected to the body by flexibleblades so arranged that the coupling of the mechanism with the body isrigid in the direction parallel to the vertical vibrating plane of thebody and flexible in the direction perpendicular to that plane.

Obviously, the invention is not restricted to the particular embodimentsthereof herein shown and described.

What is claimed is:

1. A vibrating unit comprising a body to be vibrated; means fordisplaceably, resiliently supporting said body; means for vibrating saidbody including an excenterweight mechanism rotatable about a single axisextending in a plane substantially parallel to the vertical planesoutlined by the trajectory of each point of said body; means formounting said excenter-weight mechanism on said body including flexiblemembers connecting the excenterweight mechanism to said body, saidflexible members being so positioned as to be flexible in a directionextending transversely of said body and rigid in a direction extendingparallel to said vertical planes outlined by the trajectory of eachpoint of said body, whereby the free vibration of the excenter-weightmechanism is in a direction extending transversely of said body.

2. Apparatus as set forth in claim 1, wherein said body is supported ona frame by a plurality of flexible blades.

3. Apparatus as set forth in claim 1, wherein said body is suspendedfrom a support by a plurality of flexible supporting means.

4. Apparatus as set forth in claim 1, including shock absorbing meanspositioned to reduce the excessive amplitudes of the vibrations of theexcenter-weight mechanisrn in the direction transverse to the bodyduring the passage of the critical speed when starting up and stoppingthe rotation of the excentric-Weight mechanism.

5. A vibrating unit comprising a body to be vibrated, means fordisplaceably resiliently supporting said body, and means for vibratingsaid body including transom members positioned above and extendingtransversely of said body, an excenter-weight pulley rotatably mountedon said transom members for rotation about an axis extending in a planesubstantially parallel to the vertical planes outlined by the trajectoryof each point of said body, and flexible blades having their upper endsconnected to the ends of said transom members and their lower endsconnected to said body, said blades being so positioned as to beflexible in a direction extending transversely of said body and rigid ina direction extending parallel to said planes outlined by the trajectoryof each point of said body, whereby the free vibration of theexcenter-weight pulley is in a direction extending transversely of saidbody.

6. Apparatus as set forth in claim 5, wherein said means for supportingsaid body includes a support member and a plurality of flexible bladeshaving their lower ends fixedly attached to said support member andtheir upper ends fixedly attached to said body.

7. Apparatus as set forth in claim 5, wherein said means for supportingsaid body includes a support memher having a plurality of cablesdepending therefrom and flexibly connected thereto with their lower endsconnected to said body.

8. Apparatus as set forth in claim 5, including shock absorbing meanspositioned to engage said transom memher to reduce the excessiveamplitudes of the vibrations of the excenter-weight pulley in thedirection transverse to said body.

9. Apparatus as set forth in claim 8, wherein said shock absorbing meanscomprises hydraulic mechanism mounted on said body and positioned toengage stop members carried by said transom members.

10. Apparatus as set forth in claim 8, wherein said shock absorbingmeans comprises a pair of hydraulic mechanisms each mounted on a bracketmember carried by the means for supporting said body and positioned tobe engaged by the ends of said transom members.

References Cited in the file of this patent UNITED STATES PATENTS1,705,619 Kendall Mar. 19, 1929 FOREIGN PATENTS 45,426 Switzerland Oct.3, 1908

